Lead pencil



DA ZAKIVI.

LEAD PENCIL.

APPLlcATloN FILED ffl/m13. 1922.

Patemted Oct.

INVENTOR: .0H/ma Z/f/M.

ATTORNEY.

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:DAVID ZAIIKIIVI, F NEW YORK, N.

Y., ASSIGNOR T0 STERLING METAL NOVELTY MFGl- C0., INC., OlE NEW YORK, N.Y., A CORPURATJEON OIF .NEW YORK.

o nnen relucir...

Application filed. March 13, 1922. Serial No. 543,133.

. To all whom t may concern:

lBe it known that I, DAVID ZAKIM, a citizen of Poland, and a resident of New York, in the county of Bronx and State of New York, have invented certain new and useful Improvements in Lead Pencils, of which the i following is a specification,

'llheinvention relates to improvements in mechanical lead pencils of the propeller type, and resides in the novel features of construction and relative arrangement of partshereinafter described and claimed.

The pencil of my invention comprises an exterior tubular barrel or casing tapered at its forwardend to form a` tip-member, an interior concentric lead-holding and guiding tube whose forward end is tapered to engage the inner tapered walls of said tipinember near the forward end thereof, an ornamental-head in which said tube is, at its rear end, secured and which closes the .rear i endV of said exterior casing and has a forward cylindrical plug entering'said end and holding said tube, a propeller rod within said tube and having a lug extending through and adapted to travel along a longitudinal slot therein', and a spiral spring or spiral rod within said exterior casing and encompassing said tube and receiving within its convolutions said lug `of the propeller rod, said spring having two diameters, the one of smaller diameter extending throughout the main extent of the spring and closely encompassing said tube without binding against the same, and the one of larger diameter being closely coiled and constituting a headwhich very closely lits within said exterior casing and binds against the saine with such force as to render the spring stationary therewith.

@ne of the novel features of my invention resides in the provision of the aforesaid spiral spring or spiral rod in one part closely encompassing the clutch tube without binding against it and in the other part so tightly engaging the exterior barrel or casing that the spring and casing become so rigidly con. nected together that thecasing cannot rotate on the spring nor the spring within the casfurther novel feature of my invention resides in having the tapered forward end of the clutch tube engage the inner walls of the tip-member ofthe pencil and in providing on the rear end of said tube the head which carries the tube and closes the outer end of the main casing and is capable of' rotary movement therein and thereon for rotating said tube and causing the lug on the propeller rod therein to travel along the convolutions of the spiral spring or rod.

'llhe pencil of my invention also comprises other desirable features which will presently be described, and the object of the invention is to provide a comparatively inexpensive `mechanical pencil of improved construction and of increased reliability and eiciency in operation.

The invention will be fully understood from the detailed description hereinafter presented, reference being had to the accompanying drawings, in which:

ig. 1 is a central longitudinal section, on an enlargedscale, through a pencil embodying my invention;

E ig. 2 is a corresponding view ofthe outer caslng of the pencil detached;

F ig. 3 is a side elevation of the interior assembled parts of the pencil shown as withdrawn from the outer casing thereof or ready for insertion into said casing;

Fig. 4 is a detached side elevation of the clutch-tube, and

Fig. 5 is a vertical transverse Isection through the pencil, taken on the dotted line 5-5 of Fig. 1.

ln the drawings 10 designates the exterior tubular casing of the pencil, 11 the interior lead-holdin tube, 12 the head carrying said tube and a apted to the outer or rear end of said casing, 13 the propeller rod within said tube and 14C the spiral for cooperation with said propeller rod, said spiral throughout its extent or body portion 15 being of a diameter adapted to closely encompass the tube 11 without bindin and at one end being of a larger diameter and closely wound to form a head 16.

'llhe casing 10 is ya plain tube shaped at its forward end to form a taperedv tip-member 17 whose outer end portion is slit inwardly at opposite sides, as at 9, to form a clutch for engaging the lead.

The tube 11 is concentrically within the casing 10 and taperedV at its forward end, as at 18, to form a close t against the inner tapered walls of the tip member 17, as show-n in Fig. 1. rll`he tube 11 is adapted to holdthe piece or stick of lead 19, and said tube is formed in its sidev with a'longitudinal against the same slot 20, which commences at the rear end of the tube and terminates at about the osition of the forward end of the spira 14,

and has an annular beading 23 to shoulderagainst the rear end of the casing 10 and an extension or plug section 24 to closely enter and lill the rear end of said easing, said section 24 being of considerable length so as to have a substantial bearing in the casing 10 and be capable of uniformity of rotation within said casing when turned by pressure applied by the thumb and finger to the eX- posed knob portion of the head 12. The

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section 24 also has a deep concentric socket 25 which rigidly holds the rear end portion of the tube 11, the slot in said tube permitting said end portion to be expanded and then crowded into said socket so as to effect a rigid connection of the tube with the head 12. The head 12 and tube 11 are rigidly connected together so that rotary motion may be imparted to said tube from said head.

The propeller rod 13 is a plain straight rod adapted at its forward end to engage the rear end of the stick of lead. 19, as usual, and having at its rear end a Hat lug 22 which projects laterally through andrv guides in the slot v20 of the tube 11. The lug 22 extends outwardly between the convolutlons of the spiral 14 and in length is only slightly less than the space between said convolutions, as shown in Fig. 1. During the operation of the rod 13, said rod may be moved forwardly until the lug 22 becomes arrested at the forward end of the slot 20 and maybe moved rearwardly until said lug becomes arrested by the stop lugs 21, which are so placed as to prevent the lug 22, in regula-r operation,rfrom leaving the regularly formed convolutions of the body portion 15 ofthe spiral 14. The forward end of the slot 20 in the tube 11 is so posi-l tionedI with .relation to the spiral 14 that the lug 22 becomes arrest/ed thereat while said lug is still confined by the spiral, said lug thus being prevented from escaping from the forward end of the spiral.

rlhe spiral 14 is formed by ceiling a rod of wire to form the body portion 15 and head 16 thereof, said portion 15 snugly, though freely, encompassing the tube 11, and the head 16 being of increased diameter and formed of close side-by-side convolutions of the rod of wire and very tightly fitting the rear end of the exterior casing 10 so as to become bound thereto. rlhe head 16 is of adequate length to obtain a reasonably long bearing against the interior of the casing 10 and is independent of the head 12, whose plug-section 24 reaches the rear end of said head 16. The spiral 14 remains rigid with the casing 1() during the rotary movement of the head 12 and tube 11, and to accomplish this result is the reason for the head 16.

ln practice the interior parts of the pencil will be assembled in the manner shown in Fig. 3. less the lead 19, and inserted into the casing 10 from the rear end thereof, all of the parts with reasonable freedom entering the casing 10 with the exception of the head 16 which requires a limited amount of pressure to force it into the casing 1l), since said head is meant to tightly bind against said casing and position the body of the spiral therewith. The pressure required for forcing the head 16 into the casing 10 may be conveniently applied to the head 12 whose plug-section 24 when moved into the rear end of the casing 1() will force said head 16 in advance of it to position within said casing. After the parts of the pencil have been assembled, the lead 19 may be introduced thereto in the usual well understood manner, the propeller rod 13 being 4moved forwardly against the lead to project it and rearwardly to allow the lead to be pushed back into the encil, and said rod being operated by rotating the head 12 andtube 11 in one direction or the other, as may be required, to carry the lug 22 on said rod along the convolutions of the body portion 15 of the stationary spiral 14.

One important feature of my lead pencil resides in the fact that'the forward or tip end of the casing -10 is slit at 9 to create a clutch for holding the lead during the use of the pencil in writing. The tube 11 not being slit at its forward end is not a clutch tube. I have found that variations in the sticks of lead 19 result in breakage at the writing point of the lead when the tube 11 is made to constitute the clutch, and I have also found that when the clutch feature is transferred from the tube 11 to the forward end of the tip-member 17, as I have shown, the leads are very much less liable te breakage at the point and that the pencil as a whole is better adapted to accommodate itself to the irregularities of the leads 19.

The lug 22 is so proportioned with respect to the inner diameter of the head 16 that I may screw the tube 11 inwardly into the spiral 14 until said lug reaches its proper position within the body-portion 15 of the spiral. Thereafter the tube 11 carrying the spiral, as shown in Fig. 3, may be pushed into the casing 10. If preferred the spiral 14 may be introduced into the casing 10 before the tube 11 is applied to position. After inerme lthe-.tube 11 and spiral 14 arein position within the casing l may look the tube 1l andk casing 10 together by means of an annular groove 8 formed in the head 24: and a depression 9 formed on the casing by driving v a small portion thereof inwardly into said fte groove." 'l`hegroove 8 and the depression or lug 9 entered therein, will permit the head 12 and tube 11 to be rotated in either direction,v but said groove and depression will prevent the tube 11 from being withdrawn outwardly from the casing. The parts'are` of such durable construction that it will not be necessary to withdraw the tube 1l.r from the casing 1Q, since` the leads 19 may always be introduced to said tube 11 from the tipend of the casing v10. 'lhe structure. is entirely operative `.without `the groove 8 and depression 9, and said features are only provided when it'zis desired that the interior parts of the pencil shall not be withdrawn from the casing 10; f

llt will be seen that ymy pencil is composed ofa few durable partswhich may be easily assembled and which when assembled pro.

Vvide a pencil which is ecient in use and not liable to become out oforder or require special attention.

What l claim as m invention and desire to secure by Lettersatent, is-

4l. A lead pencil comprising an exterior tubular casing having a forward tip-member, a rotary head at the rear end of said casing, a lead-holding tube secured to said head and longitudinally slotted in one side, a propeller rod within said tube having a laterally extending lug to guide in said slot thereof, and a splral encompassing said tube and receiving between its convolutions the outer end of said lug, said spiral having a body portion of uniform diameter along which said lug has its traveling movement and a -head portion of larger diameter ing.

tightly tltting said casing and stationary therewith.

tubular casing having a forward tip-member, a rotary head at the rear end of said casing, a leadlholding tube Isecured to said head and longitudinally slotted in one side, a propeller rod within said tube having a laterally extending lug to guide in said slot thereof, and a spiral encompassing said tube and receiving between its convolutions the outer end of said lug, s'aid spiral having a body-portion of uniform diameter along which said lug has its traveling movement anda closely coiled head of larger diameter tightly fitting said casing spiral stationary therewith.

.3. A lead pencil comprising an exterior tubular casing having a forward tip-member, a rotary vhead at the rear end of said casing, a lead-holding tube secured to said head and longitudinally slotted in one side, a propeller rod vwithin said tube having a' laterally extending lug to guide in said slot thereof, and a spiral encompassing said tube and receiving between its convolutions the and holding the outer end of said lug, said spiral having ay body portion of uniform diameter along which said lug has its traveling movement and at its rear end a closely coiled head ofA navrn atm Btl , 4:5 2. A lead pencil comprising an exterior -f 

